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If we need to reattach any OBJECT when entering printing, we cannot wait
for the resource to load again. This was especially bad for LayoutNG,
which switches the document back to legacy layout for printing, so that
everything gets reattached, so that no OBJECT would print.

To fix this, allow ContentFrame() to be re-used when re-attaching.

Bug: 913929
Change-Id: I3b11b0550a775c8df1c0449c2438569aa8219091
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1459542Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654821}